* [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
@ 2025-12-31 6:02 syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2025-12-31 6:02 UTC (permalink / raw)
To: andrii, ast, bpf, daniel, eddyz87, haoluo, john.fastabend, jolsa,
kpsingh, linux-kernel, martin.lau, sdf, song, syzkaller-bugs,
yonghong.song
Hello,
syzbot found the following issue on:
HEAD commit: 3f0e9c8cefa9 Merge tag 'block-6.19-20251226' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14d784fc580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151f1b92580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144f5022580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7f2d5650d243/disk-3f0e9c8c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/069034860f2d/vmlinux-3f0e9c8c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/90d1c240dc1b/bzImage-3f0e9c8c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
pskb_expand_head+0x310/0x15d0 net/core/skbuff.c:2290
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
skb_data_move+0x424/0x570 include/linux/skbuff.h:-1
skb_postpush_data_move include/linux/skbuff.h:4639 [inline]
bpf_skb_generic_push net/core/filter.c:3267 [inline]
bpf_skb_net_hdr_push net/core/filter.c:3305 [inline]
bpf_skb_net_grow net/core/filter.c:3542 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x116c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4960 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
pskb_expand_head+0x1fc/0x15d0 net/core/skbuff.c:2282
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 6072 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260102021954.297351-1-kartikey406@gmail.com>
@ 2026-01-02 2:45 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-02 2:45 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in bpf_prog_test_run_skb
=====================================================
BUG: KMSAN: uninit-value in bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
pskb_expand_head+0x324/0x15d0 net/core/skbuff.c:2291
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
skb_data_move+0x424/0x570 include/linux/skbuff.h:-1
skb_postpush_data_move include/linux/skbuff.h:4639 [inline]
bpf_skb_generic_push net/core/filter.c:3267 [inline]
bpf_skb_net_hdr_push net/core/filter.c:3305 [inline]
bpf_skb_net_grow net/core/filter.c:3542 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x116c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4960 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
pskb_expand_head+0x20a/0x15d0 net/core/skbuff.c:2282
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 6566 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================
Tested on:
commit: b69053dd wifi: mt76: Remove blank line after mt792x fi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ab2a9a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=15863fb4580000
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260104020145.4942-1-kartikey406@gmail.com>
@ 2026-01-04 2:26 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-04 2:26 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in bpf_prog_test_run_skb
=====================================================
BUG: KMSAN: uninit-value in bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
pskb_expand_head+0x31a/0x15f0 net/core/skbuff.c:2290
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
skb_data_move+0x424/0x570 include/linux/skbuff.h:-1
skb_postpush_data_move include/linux/skbuff.h:4639 [inline]
bpf_skb_generic_push net/core/filter.c:3267 [inline]
bpf_skb_net_hdr_push net/core/filter.c:3305 [inline]
bpf_skb_net_grow net/core/filter.c:3542 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x116c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4960 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
pskb_expand_head+0x201/0x15f0 net/core/skbuff.c:2282
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 6585 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================
Tested on:
commit: aacb0a6d Merge tag 'pmdomain-v6.19-rc3' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16e50074580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=1231369a580000
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260104034826.7723-1-kartikey406@gmail.com>
@ 2026-01-04 5:21 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-04 5:21 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in bpf_prog_test_run_skb
=====================================================
BUG: KMSAN: uninit-value in bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
pskb_expand_head+0x3b1/0x16b0 net/core/skbuff.c:2291
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
skb_data_move+0x424/0x570 include/linux/skbuff.h:-1
skb_postpush_data_move include/linux/skbuff.h:4639 [inline]
bpf_skb_generic_push net/core/filter.c:3267 [inline]
bpf_skb_net_hdr_push net/core/filter.c:3305 [inline]
bpf_skb_net_grow net/core/filter.c:3542 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x116c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4960 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
pskb_expand_head+0x20a/0x16b0 net/core/skbuff.c:2282
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 0 UID: 0 PID: 6518 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================
Tested on:
commit: aacb0a6d Merge tag 'pmdomain-v6.19-rc3' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1682169a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=1109da9a580000
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260104035833.8404-1-kartikey406@gmail.com>
@ 2026-01-04 6:12 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-04 6:12 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in bpf_prog_test_run_skb
=====================================================
BUG: KMSAN: uninit-value in bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run_skb+0x3091/0x3200 net/bpf/test_run.c:-1
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
pskb_expand_head+0x35a/0x1610 net/core/skbuff.c:2291
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
skb_data_move+0x424/0x570 include/linux/skbuff.h:-1
skb_postpush_data_move include/linux/skbuff.h:4639 [inline]
bpf_skb_generic_push net/core/filter.c:3267 [inline]
bpf_skb_net_hdr_push net/core/filter.c:3305 [inline]
bpf_skb_net_grow net/core/filter.c:3542 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x116c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4960 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
pskb_expand_head+0x204/0x1610 net/core/skbuff.c:2282
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
bpf_skb_net_grow net/core/filter.c:3511 [inline]
____bpf_skb_adjust_room net/core/filter.c:3754 [inline]
bpf_skb_adjust_room+0x103c/0x3310 net/core/filter.c:3699
___bpf_prog_run+0x1297/0xeba0 kernel/bpf/core.c:2037
__bpf_prog_run512+0xc5/0x100 kernel/bpf/core.c:2333
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_test_run+0x496/0xe00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x2377/0x3200 net/bpf/test_run.c:1158
bpf_prog_test_run+0x5bb/0x9f0 kernel/bpf/syscall.c:4703
__sys_bpf+0x873/0xeb0 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6272
x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 6582 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================
Tested on:
commit: aacb0a6d Merge tag 'pmdomain-v6.19-rc3' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=121b369a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=152c6e22580000
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260114120911.9472-1-sohammetha01@gmail.com>
@ 2026-01-14 12:17 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-14 12:17 UTC (permalink / raw)
To: linux-kernel, sohammetha01, syzkaller-bugs
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
failed to apply patch:
checking file net/core/skbuff.c
Hunk #1 FAILED at 2280.
1 out of 1 hunk FAILED
Tested on:
commit: c537e12d Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler:
patch: https://syzkaller.appspot.com/x/patch.diff?x=12d3a5fc580000
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260114123333.13206-1-sohammetha01@gmail.com>
@ 2026-01-14 13:44 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-14 13:44 UTC (permalink / raw)
To: linux-kernel, sohammetha01, syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
Tested-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
Tested on:
commit: c537e12d Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118fd92a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=46b5f80a6e7aaa5c
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=16f4b2ef980000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
2026-01-14 13:56 [PATCH] net: skbuff: fix uninitialized memory use in pskb_expand_head() Soham Metha
@ 2026-01-14 15:06 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-14 15:06 UTC (permalink / raw)
To: andrii, ast, bpf, daniel, eddyz87, haoluo, john.fastabend, jolsa,
kpsingh, linux-kernel-mentees, linux-kernel, martin.lau, sdf,
shuah, sohammetha01, song, syzkaller-bugs, yonghong.song
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
Tested-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
Tested on:
commit: c537e12d Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12188522580000
kernel config: https://syzkaller.appspot.com/x/.config?x=46b5f80a6e7aaa5c
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=15f21d9a580000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb
[not found] <20260330023746.1917493-1-sun.jian.kdev@gmail.com>
@ 2026-03-30 3:45 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-03-30 3:45 UTC (permalink / raw)
To: linux-kernel, sun.jian.kdev, syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
Tested-by: syzbot+619b9ef527f510a57cfc@syzkaller.appspotmail.com
Tested on:
commit: 7aaa8047 Linux 7.0-rc6
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17687cca580000
kernel config: https://syzkaller.appspot.com/x/.config?x=47cb6c6d64036629
dashboard link: https://syzkaller.appspot.com/bug?extid=619b9ef527f510a57cfc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=1433d9da580000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2026-03-30 3:45 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
[not found] <20260102021954.297351-1-kartikey406@gmail.com>
2026-01-02 2:45 ` [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb syzbot
[not found] <20260330023746.1917493-1-sun.jian.kdev@gmail.com>
2026-03-30 3:45 ` syzbot
2026-01-14 13:56 [PATCH] net: skbuff: fix uninitialized memory use in pskb_expand_head() Soham Metha
2026-01-14 15:06 ` [syzbot] [bpf?] KMSAN: uninit-value in bpf_prog_test_run_skb syzbot
[not found] <20260114123333.13206-1-sohammetha01@gmail.com>
2026-01-14 13:44 ` syzbot
[not found] <20260114120911.9472-1-sohammetha01@gmail.com>
2026-01-14 12:17 ` syzbot
[not found] <20260104035833.8404-1-kartikey406@gmail.com>
2026-01-04 6:12 ` syzbot
[not found] <20260104034826.7723-1-kartikey406@gmail.com>
2026-01-04 5:21 ` syzbot
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2026-01-04 2:26 ` syzbot
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